Main cast •
Ji Hyun-woo as Jang Dol-mok / Kim Soo-hyun •
Kim Kang-hoon as young Jang Dol-mok :Baek-san's descendant and an Olympic-level fencer. His identity is hidden by his foster father as he is the key to find the treasure map. He is also a vigilante who specializes in exposing corruptions of the upper-class. •
Seohyun as Kang So-joo • Moon So-hee as young Kang So-joo :A police-woman-turned-investigator who struggles to fight against the abusive officials. •
Kim Ji-hoon as Han Joon-hee / Jang Min-jae •
Nam Da-reum as young Jang Min-jae •
Moon Woo-jin as child Jang Min-jae :Dol-mok's missing adopted brother. He holds grudges because of his bitter past and vows to change his ill-fated life. Eventually, he becomes a prosecutor who seeks to gain power in the legal ladders to take down corrupted powerful people. •
Lim Ju-eun as Yoon Hwa-young • as young Yoon Hwa-young :So-joo's friend turns enemy. A wolf in sheep's clothing. She likes to get everyone's attention. She appears to like Joon-hee but only actually frustrated because he shows no signs of liking her.
Supporting People around Jang Dol-mok •
Ahn Gil-kang as Jang Pan-soo • Jung Kyung-soon as Park Ha-kyung •
Shin Eun-jung as Min Hae-won
People around Kang So-joo •
Kim Jung-tae as Kang Sung-il, So Joo's father
Yoon Joong-tae's family and Hong family •
Choi Jong-hwan as Yoon Joong-tae •
Choi Su-rin as Hong Shin-ae •
Jang Gwang as Hong Il-kwon •
Seo Yi-sook as Hong Mi-ae • as Lee Chang-young • … as Yang Ki-young • as Lee Yoon-ho •
Jeon Jin-seo as young Lee Yoon-ho •
Han Jung-soo as Choi Tae-suk
Extended • Lee Joo-sil as Kim Soon-chun •
Lee Jung-eun as Kwon Jung-hee •
Woo Hee-jin as Park Sun-jin • Lee Se-chang as Lee Eun-suk • Lee Sang-woo as Oh Song-sik • Yoon Ji-won as Go Eun-ji • Ryu Ji-an as Park Yeo-wool •
Shorry J as Heo Jong-bum • Kim Joon-won as Choi Kang-gyu • Lee Bong-won as Nam Jong-hab • Jo Duk-hyun as Kim Chan-gi • Kang Ji-won as Secretary Heo • Ko Byung-wan as Song Gook-hyun
Special appearances • Kim Dae-sung •
Kim Young-hee • Yoon Yong-hyun as Lee Chul-ho ==Ratings==